Island



2 Sheets--Sheet I.

(No Model.)

S. L. WORSLBY.

STOP MGTION POR LATHBS.

Patented Mar. 5, 1889.

` INVENTUR MTESEEE.. (y0 M4 2 Sheets-Sheet 2.

(No Model.)

S. L. WORSLEY. STOP MOTION POR LATHBS.

Patented Mar. 5, 1889.

www

Nv PETERS, PrwwLnhognpMr. wnmmgxm tu:V

UNITED STATES PATENT OFFICE.

SAMUEL L. WORSLEY, OF 'FAUNTON, MASSACHUSETTS, ASSIGNOR TO THE BROXVN & SIIARPE )IAIFACTDRTNG COMPANY, OF PROVDECE, RHODE ISLAND.

STOP-MOTION FOR LATHS.

SPCIFCATION forming part of Letters Patent No. 398,87 1, dated March 5, 1889.

Serial No. 279,330. (No model.)

Application filed July 9, 1888.

.To all whom, it may concern:

Be it known that I, SAMUEL L. WoRsLEY, of Taunton, in the eounty of Bristol and Commonwealth of Massaehusetts, have invented certain new and useful lm provem ents in Stop- Motions for Lathes; and I do hereby declare that the following specification, taken in oonne'etion with the drawings making` a part of the same, is a full, clear, and exact descrip- 1o tion thereof.

Figure 1 is a vertical transverse section of an engine-lathe on the line A B of Fig. 3. Fig 2 is a view, partly in section and partly in elevation, showing the tripping-latch. Fig.

3 is a front View of a portion of an enginelathe. Figs. 4 to 8, inclusive, represent details.

Stop-motions for lathes have long been in use, and generally consist in a combination 2o of devices whieh operate to cause a belt-shipper to be moved at the required time to run the driving-beltI from the fast to the loose pulley.

My improveinentconsists in an improved ing Carriage shall be instantly stopped by .disconnecting the carriage from the source of power which moves it, while the other parts of the lathe may continue in operation until it is convenient to shift the driving-belt and stop the entire maehine.

In the accompanying drawings, L (in Figs.

l, 2, and 3) is the ordinary traveling bed of an engine-lathe upon which the tool-holder, adapted to slide at. right angles therewith, is mounted. Motion is given to this bed or eareombination of devices whereby at an api f pointed time the movementof the tool-earryriage when the lathe is at work for turning by means of the worm 9, Fig. 3, revolving with the screw-shaft S, with which it is eonneeted by means of a groove and spline, so as to ltraverse the shaft, but revolve with it. '.lhis worin E) engages with the worm-wheel lil, Figs. 1 and 2,whereby,through the pinion lO termediate gear, 12, Fig. 3, and its pinion 11 gives the proper movement to the bed E. through the raek 7, with the teeth of which 1, so as to form a flange. faee of this ange is plaeed a divided ring, 23,

the said pinion 11, set fast on said gearwvheel 12, engages.

The leading-screw S, whieh is shown at Fig. 3, and which is in constant revolution when the driving-belt is on the fast pulley, is used when the lathe is employed for euttingscrewthreads; but it may be disregarded in the present combination, in which the movement of the carriage 2, when carrying a turningtool, is not obtained from such screw, but from the worm and train of gearing above described. Said leading-serew derives its 6o motion from the head-spindle of the lathe through a train of eonneeting-gears in a common way.

The worin-wheel 13, driven, as above stated, by the worm 9, is loosely mounted on its hollow sleeve' shaft, as shown in section at Fig. 1; butthe pinion l0, Figs. 1 and 2, is fixed to the same sleeve. If the worin-wheel 13 be prevented from revolving on its shaft, then l it will connect the eonstantly-revolving worin 9 with the train of gears 10, 12, and 11 and the rack 7 and give movement to the carriage If, however, it be allowed to revolve freely on its shaft, no movement will be given to the Carriage.

The worin-wired .13 is Capable of being locked to its shaft by means of a frictioncluteh. (Shown at Fig. 6.) The back side of the worin-wheel is eored out, as shown at Fig.

Against the inner SO Fig. (i. This ring eau be expanded to a larger diameter by means of wedges 25, when the same are foreed into the joints between the sections of the ring. These wedges 25 (of 85 Fig. (i) are shown in seelion at Fig. l. The v form, with the part marked Q6, bell-crank lee .ivers, and are mounted in a holder, Fig.

on the same shaft, motion is given t-o the iny,

i which is keyed to the shaft 1l., Fig. l, and

stands arranged relatively to the worm-wheel 9o 13, as shown in section at Fig. .1. The wedges 25, or shorter arms of the bell-cranks, are made, preferably, adjustable in position relatively to the longer arms, 2G, by means of adjusting-serews 27, such shorter arms being pi voted to the longer arms and having shoulders against which the ends of the adjustingscreWs 27 can bear. The object ofthis adjustability is to compensate for the wearing away of the faces of the Wedge 25.

It is obvious that when ever the longer arms, 26, of the bell-crank levers are moved toward the left (looking at Fig. 1) the faces of the wedges will be moved 'radially outward, and, entering the joints between the sections of the friction-ring 23,will spread the sections apart and cause them to lact as a powerful friction-clamp against the interior face of the flange of worm-wheels 13. This movement for this purpose is effected Yby the operator of the machine when he raises the quadrantshaped lever 32, Fig. 2, by means of its handle. This lever is keyed to a shaft, 2 2,Which carries a yoke or fork, 19, the cross-bars of which engage with a groove, 2l, in t-he central rod, 40, Fig. 1. Now the ends of thelonger arms, 26, of the bell-cranks enter a slot or mortise in this rod, and consequently when the operator raises the quadrant-lever 32 the frictionbrake will be applied to stop the separate revolution ofthe wormwheel 13. It is very desirable that the rod should be seated against a spring, 16, the strength of which can be regulated by an adjusting-screw, 17, so that upon the tripping of the latch, hereinafter to be mentioned, for holding the quadrant-lever 32 the wedges will be instantly withdrawn from their action on the friction-ring 23, and the worm-wheel 13 be free to revolve on its shaft.

The effect .of moving the quadrant-lever 32 Y to the position shown at Fig. 2 being to bring the friction-clutch above described into action, it follows that the Worm-wheel, the sleeve upon which it is loosely mounted, the pinion 10, fast to such sleeve, and the shaft 14 will be revolved as one, and by means of the gears 12 and 11 and the rack 7 movement will be given to the carriage 2.

The lever 32 is held in position by the catchlever 33, Fig. 2, and so long as the machine is in this condition and power is applied to the Vdriving-pulley the carriage 2, which carries the tool-post, will be travelin To effect the instantaneous stopping of the cutting of the tool in turning a piece of metal at a predetermined place, a stop-pin, 31, Fig. 3, having an inclined or conical end, is set in a block, 28, which block can be adjusted in position on the lathe-bed by means of a set.- screw, 30. A ine adjustment in addition can be made by turning the stop-pin to the right or to the left, its shank where it enters the block 28 being screw-threaded for that purose.

Vhen the carriage has advanced so far that the catch-lever 33 comes into contact with the conical end of the stop-pin 31, the lever will be raised by the progressive movement of the carriage, causing the lever to ride up the cone or incline, and thereupon a disconnection will be effected between the driving-worm 9 and the train which moves the tool-carriage, While at the saine time the spindle of t-helathe may continue to revolve.

It will be seen that by the means above described a disconnection between-thesource of power and the carriage carrying the cuttingtool is capable of being effected with certainty and Without any liability of any dragging or sluggishness in action. The gradual upward movement of the catch-lever 33 does not act as does the gradual sepa-ration of the two parts of an ordinary clutch-box connection, by which the continuity of trains of gearing is broken. It is not until the catch has released the lever 32 that the disconnection is made, and it then is instantaneous. This capacity is of prime importance in saving the necessit-y of close personal supervision in turning certain varieties of work-as, for instance, in turning a rod up toa shoulder on the same or the shank of a bolt up to its head.

What I claim as my invention, and desire to secure by Letters Patent, is-e 1. The combination, substantially as hereinbefore set forth, of a Worm driven by the power which drives the head-spindle of the lathe, a worm-wheel driven by saidl worm, a Y

friction -clutch for connect-ing said worm- Wheel with the train which communicates movement to the tool-carriage or for disconnecting it therefrom, a lever for working said friction-clutch, a holdin g-catch for locking the lever to close the clutch, a sliding tool-post carriage, and a stop for tripping the holdingcatch, substantially as described.

2. The combination of a friction-clutch connecting the train of gearingwhich gives movement to the tool-carriage with the prime mover, a lever for Working said clutch to make or break such connection` a holding-catch for locking the lever to close the clutch, a sliding f tool-post carriage, and a stop for tripping the holding-catch, substantially as described.

SAMUEL L. lVORSLEY.

lfitnesses: A

W. H. THURsToN, S. J. MURPHY.

IOO 

